257634136 has 16 divisors (see below), whose sum is σ = 483337800. Its totient is φ = 128744064.

The previous prime is 257634131. The next prime is 257634161. The reversal of 257634136 is 631436752.

It is a junction number, because it is equal to n+sod(n) for n = 257634095 and 257634104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257634131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7696 + ... + 23968.

Almost surely, 2^257634136 is an apocalyptic number.

It is an amenable number.

257634136 is a deficient number, since it is larger than the sum of its proper divisors (225703664).

257634136 is a wasteful number, since it uses less digits than its factorization.

257634136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18258 (or 18254 counting only the distinct ones).

The product of its digits is 90720, while the sum is 37.

The square root of 257634136 is about 16050.9855149147. The cubic root of 257634136 is about 636.3086130632.

The spelling of 257634136 in words is "two hundred fifty-seven million, six hundred thirty-four thousand, one hundred thirty-six".